05000255/LER-1979-009-01, /01X-1 on 790220:design Review Indicated Butterfly Valves May Not Close Under Accident Conditions.Caused by Vague Purchase Specs Which Did Not Include Requirements for Closing Against Pressure

/01X-1 on 790220:design Review Indicated Butterfly Valves May Not Close Under Accident Conditions.Caused by Vague Purchase Specs Which Did Not Include Requirements for Closing Against Pressure

ML18043A660
Person / Time
Site:	Palisades
Issue date:	05/07/1979
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML18043A659	List: 05000255/LER-1979-009, Forwards LER 79-009/01X-1 05000255/LER-1979-009-01, /01X-1 on 790220:design Review Indicated Butterfly Valves May Not Close Under Accident Conditions.Caused by Vague Purchase Specs Which Did Not Include Requirements for Closing Against Pressure
References
LER-79-009-01X, LER-79-9-1X, NUDOCS 7905100252
Download: ML18043A660 (1)

LER-1979-009, /01X-1 on 790220:design Review Indicated Butterfly Valves May Not Close Under Accident Conditions.Caused by Vague Purchase Specs Which Did Not Include Requirements for Closing Against Pressure

Event date:
Report date:
2551979009R01 - NRC Website

text

UPDATE REPORT:

PREVIOUS REPOMT DATE - 03/06/79 PALISADES NRC FORM 360 (7-771 U.S. NUCLEAR REGULATORY COMMISSION L.ICENSEE EVENT REPORT CONTROL BLOCK: I

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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!During a design review of the containment building purge valves, it was CT:ITl 1 determined that the 48-in*ch and.12-inch butterfly valves may not close 1IEJ 1against a dp of greater than 2 psid or i.75 psid, respectively.

As a

((((] 1 result, the valves may not be capable of closing under ~l postulated

[§))]!accident conditions.

(The containment isolation signal occurs at 5.0 psigi~

~!Event reportable per TS 6.9.2.a.(9).

This event had no adverse effect mIJ 1upon the public health or safety.

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[]JI] I The nurchase specifications for these valves (Fisher-Continental Model rr:m 19220 48-inch and 12-inch butterfly valves) did not include requirements CIJI) I for closing against pressure.

Administrative controls will be used to DJil I maintain the valves closed whenever PCS temperature is greater than 210 I

[ITIJ I degrees F.

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